AIIMS 2018 Botany Gene Interaction MCQ Question

In the context of complementary genes, the 9:7 phenotypic ratio indicates that two different genes are required to express a single trait, with both genes needing to be present in at least one dominant form for the phenotype to be expressed. Option B represents a scenario where this interaction occurs, leading to the expected 9:7 ratio in the F₂ generation. Other options are not relevant as they do not pertain to the genetic interaction described, which is specific to complementary gene action and the resulting phenotypic ratios. Understanding this concept is crucial for interpreting inheritance patterns in genetics, particularly in dihybrid crosses involving complementary genes.